175.Combine Two Tables

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本文介绍了一个SQL查询案例，旨在从Person表中获取每个人的详细信息，包括姓名、城市和州，即使某些人可能没有对应的地址信息。通过使用左连接，确保每个人的信息都能被报告，无论其是否有地址。

Table: Person

+-------------+---------+
| Column Name | Type    |
+-------------+---------+
| PersonId    | int     |
| FirstName   | varchar |
| LastName    | varchar |
+-------------+---------+
PersonId is the primary key column for this table.

Table: Address

+-------------+---------+
| Column Name | Type    |
+-------------+---------+
| AddressId   | int     |
| PersonId    | int     |
| City        | varchar |
| State       | varchar |
+-------------+---------+
AddressId is the primary key column for this table.

Write a SQL query for a report that provides the following information for each person in the Person table, regardless if there is an address for each of those people:

FirstName, LastName, City, State

SELECT Person.FirstName, Person.LastName, Address.City, Address.State from Person LEFT JOIN Address on Person.PersonId = Address.PersonId;